Spectacles-type image display device

Abstract

A spectacles-type image display device provided with an image output unit that includes a display element for displaying images and a projection lens for magnifying and projecting the images and a reflection unit that is disposed adjacent to at least one of spectacle lenses and reflects the image light output from the image output unit toward the eyeball is provided. The reflection unit is a reflection member having no refractive power and an effective luminous flux that is output from the image output unit and reaches the eyeball is configured so that the width of the luminous flux perpendicular to an optical axis is minimum at the reflection unit with respect to the optical axis cross-section in at least one direction.

1. A spectacles-type image display device, comprising:
 an image output unit that is disposed on a frame of spectacles and includes a display element for displaying an image and a projection lens for magnifying and projecting the image; and 
 a reflection unit that is disposed adjacent to at least one of spectacle lenses and is configured, when a viewer wears the spectacles, to reflect image light that is output from the image output unit toward an eyeball of the viewer so that the viewer can see a virtual image of the image, 
 wherein the reflection unit is a reflection member having no refractive power, and an effective luminous flux that is output from the image output unit and reaches the eyeball of the viewer is configured so that a width of the luminous flux perpendicular to an optical axis is the smallest at the reflection unit with respect to an optical axis cross-section of the image light in at least one direction. 
 
     
     
       2. The spectacles-type image display device according to  claim 1 , wherein the smallest width of the cress-section perpendicular to the optical axis is smaller than 4 mm, which is an average pupil diameter of human. 
     
     
       3. The spectacles-type image display device according to  claim 1 , wherein, with respect to a reflection surface of the reflection member, a width in a direction parallel to an incident surface is smaller than a width in a direction perpendicular to the incident surface. 
     
     
       4. The spectacles-type image display device according to  claim 3 , wherein the display element is in the shape of rectangular and is disposed so that the longitudinal direction of the shape of rectangular corresponds to the smallest width direction of the reflection surface of the reflection member. 
     
     
       5. The spectacles-type image display device according to  claim 1 , wherein, with respect to the effective luminous flux that is output from the image output unit and reaches the eyeball of the viewer, a pupil position in the lateral direction, which is an exit pupil position with respect to the optical axis cross-section parallel to the incident surface of the reflection member, is located near the reflection member, and a pupil position in the longitudinal direction, which is an exit pupil position with respect to the optical axis cross-section perpendicular to the incident surface of the reflection member, is located closer to a pupil of the eyeball of the viewer than the pupil position in the lateral direction. 
     
     
       6. The spectacles-type image display device according to  claim 1 , wherein the reflection member is embedded in the spectacle lens. 
     
     
       7. The spectacles-type image display device according to  claim 1 , wherein an optical axis of the projection lens passes through the reflection member, and the projection lens or the image output unit that includes the projection lens is rotatably held around the reflection unit. 
     
     
       8. The spectacles-type image display device according to  claim 1 , wherein the optical axis of the projection lens passes through the reflection member, and the reflection unit is rotatably held by an axis that lies in the reflection surface of the reflection unit and is perpendicular to an incident surface. 
     
     
       9. The spectacles-type image display device according to  claim 1 , wherein, with respect to the image output unit, a deviation prism is provided between the display element and the projection lens. 
     
     
       10. The spectacles-type image display device according to  claim 9 , wherein the display element is disposed to face forward direction of the viewer, and light ray output from the display element is incident on the deviation prism, is deviated by 50° to 70° and exits toward the reflection unit. 
     
     
       11. The spectacles-type image display device according to  claim 9 , wherein the projection lens and the deviation prism are integrally molded. 
     
     
       12. The spectacles-type image display device according to  claim 9 , wherein the projection lens and the deviation prism are held by an endpiece of the spectacles, the display element is held by a temple of the spectacles and the display element is movable and adjustable in the direction perpendicular to a display surface. 
     
     
       13. The spectacles-type image display device according to  claim 9 , wherein distance between the projection lens and the deviation prism is adjustably held. 
     
     
       14. The spectacles-type image display device according to  claim 9 , wherein the projection lens and the deviation prism are held by an endpiece of the spectacles, the display element is held by a temple of the spectacles and the display element is movable and adjustable in the direction parallel to a display surface. 
     
     
       15. The spectacles-type image display device according to  claim 1 , wherein the display element is an organic EL. 
     
     
       16. The spectacles-type image display device according to  claim 1 , wherein, for the reflection unit, a projection cross-section with respect to the front direction of the viewer is disposed on a position where the projection cross-section does not cover a pupil of the viewer. 
     
     
       17. A spectacles-type image display device, comprising:
 an image output unit that is disposed on a frame of spectacles and includes a display element for displaying an image and a projection lens for magnifying and projecting the image; and 
 a reflection unit that is disposed adjacent to at least one of spectacle lenses and is configured, when a viewer wears the spectacles, to reflect image light that is output from the image output unit toward an eyeball of the viewer so that the viewer can see a virtual image of the image, 
 wherein the reflection unit that is a reflection member having no refractive power is a substantial aperture stop for an effective luminous flux that is output from the image output unit and reaches the eyeball of the viewer, with respect to an optical axis cross-section of the image light in at least one direction. 
 
     
     
       18. A spectacle-type image display device, comprising:
 an image output unit that is disposed on a frame of spectacles and includes a display element for displaying an image and a projection lens for magnifying and projecting the image; and 
 a reflection unit that is disposed adjacent to at least one of spectacle lenses and is configured, when a viewer wears the spectacles, to reflect image light that is output from the image output unit toward an eyeball of the viewer so that the viewer can see a virtual image of the image, 
 wherein the reflection unit that is a reflection member having no refractive power is an exit pupil for an effective luminous flux that is output from the image output unit and reaches the eyeball of the viewer, with respect to an optical axis cross-section of the image light in at least one direction.